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https://bugzilla.mozilla.org/show_bug.cgi?id=823173
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  <title>Test for Bug 823173</title>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=823173">Mozilla Bug 823173</a>
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/** Test for Bug 823173 **/
try {
  ok(!(navigator instanceof Window), "navigator is not an instance of Window");
} catch (e) {
  ok(false, "instanceof tests should not throw");
}
</script>
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